RT Journal Article SR Electronic T1 Genotypic Frequencies among Close Relatives of Propositi with Conditions determined by X-Recessive Genes JF British Journal of Preventive & Social Medicine JO Br J Prev Soc Med FD BMJ Publishing Group Ltd SP 183 OP 187 DO 10.1136/jech.12.4.183 VO 12 IS 4 A1 Knox, George YR 1958 UL http://jech.bmj.com/content/12/4/183.abstract AB